1 / 12

Conformational Behavior and Thermal Effects in Semicrystalline Polymers

Explore the macro-molecular conformations, tacticity, and properties of bulk semicrystalline polymers like polyethylene, polystyrene, polypropylene, and poly(methyl methacrylate). Investigate the size and location of side groups, chain folding models, and fringed micelle model. Learn about the factors affecting Tg and Tm, phase transition temperatures, and the behavior of crystallites as defects. Understand the differential scanning calorimetry results and the impact of internal mobility, chain length, and cross-linking on polymer properties.

patriciav
Download Presentation

Conformational Behavior and Thermal Effects in Semicrystalline Polymers

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Tacticity

  2. Semicrystallinepolymer

  3. Size and location of side groups Polyethylene Polystyrene Polypropylene Poly (methyl methacrylate)

  4. Macro molecular conformations (1) (2) (3)

  5. Tacticity determined conformation • Atactic polypropylene • Isotactic polypropylene • Atactic polystyrene • Syndiotactic polystyrene

  6. Fringed micelle model (1) (2) Chain folding models (1) (2) (3)

  7. Properties of bulk semicrystallinepolymer Experimental results indicates crystallite behave like defect resulting in higher values of (1) (2) (3) (4) (5)

  8. Thermal effects on crystallinity Tm: Tg: (1) (2) (3) (4)

  9. Six factors affecting Tg (1) nf: (2) Secondary forces: (3) Internal mobility: ns n

  10. Six factors affecting Tg (4) Chain/backbone Stiffness: (5) Chain length: (6) cross-linking: Poly (diallyl phthalate)

  11. Phase transition temperatures, Tg& Tm First order transition Specific volume, n (cm3/g) Second order transition Tg Tm T(°C)

  12. Differential scanning calorimetry

More Related